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Answer:
a substance made by mixing other substances together.
Explanation:
Answer:
1. Oxygen
Total no of electrons 8
Group 6
No of valence electrons 6
Period 2
No of valence shell 2
2.Sodium
Total no of electrons 11
Group 1
No of valence electrons 1
Period 3
No of valence shell 3
3. Phosphorus
Total no of electrons 15
Group 5
No of valence electrons 5
Period 3
No of valence shell 3
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